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K21

⚠ Non-billable (Header)

Gastro-esophageal reflux disease

Diseases of the digestive system (K00-K95)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

direct

Cannot be coded with K21

  • • newborn esophageal reflux (P78.83)

Child Codes (2)

K21.0Gastro-esophageal reflux disease with esophagitisK21.9Gastro-esophageal reflux disease without esophagitis

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Code Information

CodeK21
BillableNo — Header code
CategoryDiseases of the digestive system (K00-K95)
Excludes11 rule(s)
Excludes20 note(s)
Child codes2

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)